Well this happens to me (20% of times) on a 15.04 64 bit Vmware player virtual machine, with "Gallium 0.4 on SVGA3D" graphics driver. Powering off the VM (equivalent to pulling the plug in a physical one) and booting up again seems to solve the problem... until it repeats. [Not yet dist-upgraded to today's version]. So it is not a "Lenovo notebook" only issue.
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